docs: def _latex_float(f, format=".3g"):
      """ http://stackoverflow.com/a/13490601
      """
      float_str = "{{0:{0}}}".format(format).format(f)
      if "e" in float_str:
          base, exponent = float_str.split("e")
          return r"{0}\times 10^{{{1}}}".format(base, int(exponent))
      else:
          return float_str